There's another thread floating around about water quality.
To sum up what I said there, think happy thoughts towards your water, get a filtration system, and let it soak up sun energy and/or moon energy. Oh, and plastic = bad.
That being said, I don't quite follow my own advice (though I really wish I did). I use a Britta filter (plastic) and I never meditate/pray on it or let it soak up cosmic energy. But now that it's been mentioned again, I'm gonna go filter some water into a glass jug and leave it out in the sunlight.
Cheers for the reminder!
-Random Violin Guy